osca x64 uefi

intention

• minimalist uefi bootable kernel
• render graphics on screen
• keyboard
• timer
• main core schedules jobs executed by remaining cores

scope

• x86-64 only
• uefi gop required
• acpi 2.0+
• assumes compliant modern firmware and hardware
• no legacy bios
• ps/2 keyboard required
• requires more than 1 logical processor
• all memory allocated up-front
• correctness assumed; exceptions reboot the system

coding convention (opinionated)

• if possible, declare auto being the first word in a declaration
  • applies to functions, inline, constexpr, const etc
• nullptr declarations are done in non-auto way due to syntax noise
• trailing return type on functions
• use prefix increments
• everything that can be const declared as such
• private class members suffixed with _
• right to left type notation, e.g. auto const* ptr

repository

• tagged versions have been tested on asus computers with 4GB, 16GB and 32GB
• committed code works in qemu

tools used

• clang++: 21.1.6
• lld: 21.1.6
• qemu-system-x86_64: 10.2.0